<?php function replace_unicode_escape_sequence($match) { var_dump($match); return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE'); } $str = "Bal\u00edky"; $str = preg_replace_callback('/\\\\u([0-9a-f]{4})/i', 'replace_unicode_escape_sequence', $str); echo $str;
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